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4) I An assembly consists of two mechanical components. Suppose that the probabiLities that the rst and second components meet specications are 0.98 and 0.87,

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I An assembly consists of two mechanical components. Suppose that the probabiLities that the rst and second components meet specications are 0.98 and 0.87, respectively. Let X be the number of components in the assembly that meet specications. (3} Find the mean of X. (b) Find the variance of X

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